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Interactive XAFS analysis program

IFEFFIT is an interactive program for XAFS analysis. It combines the
high-quality analysis algorithms of AUTOBK and FEFFIT with graphical display
of XAFS data and general data manipulation.

IFEFFIT comes as a command-line program, but the underlying functionality is
available as a programming library. The IFEFFIT library can be used from C,
Fortran, Tcl, Perl, and Python. This allows a variety of user interfaces
(both graphical and non-graphical) to be written around IFEFFIT. Currently,
three graphical user interfaces: G.I.FEFFIT, ATHENA/ARTEMIS, and SIXPACK
are built on the underlying IFEFFIT library. IFEFFIT and all three GUIs are
under active development, but are fairly well tested and ready for use.